The Pet Turtle Shellshocking.

This Turtle id of course... A turtle... BUT HE AIN'T SLOW AT ALL.
Agent T was found swimming in the local river, A waterfall was stopping him in his tracks, He didn't give up, With a high speed in water, Unlike any other turtle he breezed up the waterfall easily.

The agency saw this remarkable skill and trained him as an agent, they enhanced his shell to withstand bullets, To reflect the bullets, He was unstoppable and became popular for 'Shoot Em' Up' missions.